JP3524043B2 - Folding ladder locking device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention holds a ladder when the folding ladder is leaned against a ladder standing surface such as a wall surface at a required angle and the upper end of the ladder is locked by a hook provided on the wall surface. However, the present invention relates to a locking device for a folding ladder for folding the ladder when it is stored (when not in use) and locking the upper end of the ladder with the hook to store it in a hanging state. It is equipped with a pair of front and rear legs with horizontal rails mounted in multiple stages between the vertical frames.The front end of the tread is pivotally attached to the upper side of the horizontal rail of the front leg, and the rear end of the tread is at the rear. Both legs are pivotally attached to the legs and both legs open in parallel so that each tread is almost horizontal. From the open leg position when using a ladder, each tread is folded parallel to the legs and both legs overlap each other. A foldable ladder that can be folded into a closed leg position when storing the ladder is used when the ladder is used and when the ladder is stored. It relates to a device for stopping.

[0002]

2. Description of the Related Art Conventionally, in this type of folding ladder, a hook for locking the ladder when using the ladder and a hook for storing the ladder that is located below the hook are attached to the upper end side of the rear leg. Attach a horizontal rod to which the above hooks provided on the rear leg of the ladder can be attached to the ladder leaning surface such as the wall on which the upper side hooks are attached to the horizontal rod when using the ladder, At the time of storing the ladder, the hook on the lower stage is locked to the side rod so that the folded ladder is stored in a suspended state.

[0003]

[Problems to be Solved by the Invention] In the conventional folding ladder,
Since the hook for locking is attached to the ladder side, when carrying the ladder when moving the ladder to another place, etc.
There is a risk that the hook may get caught on the worker's clothes and may hurt the worker's fingers.Because the folded leg of the folded ladder is locked only at the rear leg side when the ladder is stored, the folded ladder is stable in the storage position. I couldn't lock.

According to the present invention, the hook for locking is attached to the side where the ladder stands, and the horizontal rod for locking the hook is provided on the side of the ladder, so that safety can be ensured when the ladder is transported and the folded ladder. It is an object of the present invention to provide a locking device for a folding ladder, which can stably lock the vehicle in the storage position.

[0005]

The invention according to claim 1 is
A pair of front and rear legs 4 and 5 in which horizontal rails 3 are attached in a plurality of upper and lower stages are provided between a pair of left and right vertical frames 2, 2 and a front end portion of a tread plate 6 is provided on the upper side of the horizontal rails 3 of the front leg body 4. And the rear end portion of the tread plate 6 is pivotally attached to the rear leg body 5, and the two leg bodies 4 and 5 are opened in parallel so that each tread plate 6 is substantially horizontal. From the above, each tread plate 6 is folded in parallel with the legs and the legs 4 and 5 are closed so that the legs 4 and 5 face-to-face overlap with each other. And a horizontal rod 7 for locking when a ladder is used on the upper end side of the rear leg 5 and a horizontal rod for locking the ladder when it is stored below the horizontal rod 7. 8 are provided, and hooks 9 are provided at a required height position of the ladder standing surface S such as a wall surface.
The hook 9 has a horizontal rod 7 for locking the ladder when the ladder is used, and a horizontal rod 8 for locking the ladder when the ladder is stored and the horizontal bar 3 of the front leg 4 when the ladder is stored. It is characterized in that a locked portion 9b for locking is provided.

According to a second aspect of the present invention, in the locking device for a folding ladder according to the first aspect, the hooked portion 9b of the hook 9 is located close to the ladder stand surface S, and when the ladder is stored, the ladder is stored. A first engaging recess 26 into which the locking horizontal rod 8 is engaged, and a position when the ladder of the rear leg body 5 is used at a position farther from the ladder standing surface S than the first engaging recess 26 and when the ladder is used. It is characterized by having a second engaging recess 27 into which the stop horizontal rod 7 is engaged and the lateral rail 3 of the front leg 4 is engaged when the ladder is stored.

[0007]

1 is a front view and FIG. 1B is a side view showing a folding ladder 1 in use in an open-leg posture. 2A and 2B show a state of being stored in a closed leg posture, in which FIG. 2A is a front view and FIG. 2B is a side view. The folding ladder 1 is provided with a pair of front and rear legs 4 and 5 each having a horizontal rail 3 mounted in a plurality of upper and lower stages between a pair of left and right vertical frames 2 and 2, and an upper portion of the horizontal rail 3 of the front leg body 4. The front end of the tread plate 6 is pivotally attached to the side, and the rear end of the tread plate 6 is pivotally attached to the rear leg body 5, so that the two leg bodies 4 and 5 are opened in parallel so that each tread plate 6 is substantially horizontal. From the open leg position when using the ladder (see FIG. 1), the treads 6 are folded in parallel with the legs 4 and 5 and the legs 4 and 5 are closed so that they face-to-face overlap. (See Figure 2)
It can be folded down.

This folding ladder 1 is used when leaning against a mezzanine forming wall surface (ladder leaning surface) S so that the folding ladder 1 can be raised and lowered between the floor F on the first floor and the floor 2F on the mezzanine floor. As an example, when using a ladder, as shown in Fig. 1,
Side rod 7 provided on the upper end side of the rear leg body 5 for locking when using a ladder
Is attached to the upper end of the wall S for forming the mezzanine floor.
When the ladder is stored, as shown in FIG. 2, a horizontal rod 8 for locking the ladder stored below the horizontal rod 7 of the rear leg 5 and a required front leg 4 side. The horizontal rail 3 and hook 9
It is designed to be locked to. The locking device K according to the present invention is constituted by the horizontal rod 7 for locking the ladder 1 on the side of the ladder 1 and the horizontal rod 8 for locking when the ladder is stored, and the hook 9 of the wall for forming the mezzanine (ladder stand surface) S. Composed.

FIG. 3 is an enlarged view of a part surrounded by a circle shown by an arrow V in FIG. 1B, and FIG. 4 is a part of a part surrounded by a circle shown by an arrow W in FIG. 2B. FIG. Also, FIG.
1 is an enlarged sectional view taken along line XX of FIG. 1A, FIG. 6 is an enlarged sectional view taken along line YY of FIG. 2A, and FIG.
-M line sectional drawing, (B) of the figure is a NN line sectional view of FIG. The structure of the folding ladder 1 will be described in detail with reference to these drawings. The vertical frames 2 and the horizontal rails 3 forming the legs 4 and 5 and the treads 6 are made of aluminum alloy extruded mold material. The cross-sectional shapes of these mold materials are shown in FIGS. As can be seen from FIGS. 5 to 7, a shallow groove g having a substantially U-shaped cross section is formed on the inner side surface of each vertical frame 2. Both ends of the horizontal rail 3 of each leg 4, 5 are fitted in the grooves g, g on the inner side surfaces of the left and right vertical frames 2, 2 and fixed to the vertical frames 2, 2 by screws a. ing.

As can be seen from FIGS. 5 and 6, the upper end edge of each horizontal rail 3 of the front leg 4 and the front end edge of each tread plate 6 are
The cross rail side hinge portion 10 and the tread plate side hinge portion 11 that are rotatably engaged with each other are integrally formed over the entire width in the width direction, and the hinge 12 composed of these both hinge portions 10 and 11 causes the tread plate 6 to move. The front end is pivotally attached to the cross rail 3 of the front leg 4. Similarly, the horizontal rail-side hinge portion 13 and the tread-plate-side hinge portion 14 which are rotatably engaged with each other are also fitted to the upper edge portions of the respective lateral rails 3 of the rear leg body 5 and the rear end edge portions of the respective footboards 6. Are integrally formed over the entire length in the width direction.
The rear end of the tread plate 6 is pivotally attached to the cross rail 3 of the rear leg 5 by a hinge 15 composed of 3, 14.

Therefore, the horizontal rail-side hinge portion 10 of the hinge 12 which pivotally attaches the front end portion of the tread plate 6 to the horizontal rail 3 of the front leg body 4,
The guide wall portion 16 has an arc-shaped cross section, and the engagement wall portion 17 having a substantially hook-shaped cross section that projects from the inner peripheral side of the guide wall portion 16 is provided. Part 1
A guide wall portion 1 having an arcuate cross section that is rotatably fitted to the guide wall portion 6.
8 and an engaged wall portion 19 having a substantially hook-shaped cross section, which is provided on the inner peripheral side of the guided wall portion 18 and is rotatably engaged with the engaging wall portion 17.

Further, the horizontal rail-side hinge portion 13 of the hinge 15, which pivotally attaches the rear end portion of the tread plate 6 to the horizontal rail 3 of the rear leg body 5, has a guide wall portion 20 having an arcuate cross section, and this guide wall portion. 20. The engaging wall portion 21 having a substantially hook-shaped cross-section that is provided so as to project on the inner peripheral side of the step 20, and the tread-side hinge portion 14 has an arc-shaped cross section that is rotatably fitted onto the guide wall portion 20. Guided wall part 22
And a engaged wall portion 23 having a substantially hook-shaped cross section, which is protruded from the inner peripheral side of the guided wall portion 22 and is rotatably engaged with the engaging wall portion 21. As can be seen from FIG. 7, brackets 24 and 24 made of steel plates are attached and fixed to the left and right end surfaces of each tread plate 6 by screws b, respectively, and each bracket 24 has a front leg 4 side end portion. A spacer 25 made of plastic is attached to the outer surface.

FIG. 8 is an enlarged view of a portion of the locking device K surrounded by an ellipse indicated by an arrow O in FIG. 1 (B), and FIG. 9 is FIG. 2 (B).
11A is an enlarged view of a locking device K portion surrounded by an ellipse indicated by an arrow P in FIG. 10A, and FIG. 10A shows a state in which the horizontal rod 7 for locking when the ladder is used is locked to the hook 9. Enlarged vertical section,
(B) of the same figure is an enlarged vertical cross-sectional view showing a state in which the horizontal rod 8 for locking during ladder storage and the required horizontal rail 3 of the front leg 4 are locked to the hook 9 during storage of the ladder. The horizontal rods 7 for locking when the ladder is used and the horizontal rods 8 for locking when storing the ladder are hollow round shafts made of extruded aluminum alloy material, respectively, between the left and right vertical frames 2, 2 of the rear leg body 5, respectively. It is attached and fixed to.

The hook 9 is integrally formed of an extruded aluminum alloy material with a width that fits between the left and right legs 4 and 5 of the ladder 1, and contacts the wall surface (ladder resting surface) S for forming the mezzanine floor. A vertical plate-shaped mounting portion 9a that is in contact with and fixed by a screw or the like, and a horizontal rod 7 that is horizontally projected from the mounting portion 9a and that is used when the ladder is used to lock the ladder when using the ladder. It is composed of a horizontal rod 8 for locking the rear leg 5 side when the ladder is stored and a horizontal rod 8 for locking the ladder when storing the ladder, and a locked part 9b for locking the horizontal rail on the front leg 4 side. Locked part 9b
Is a position closer to the wall surface S, and has a first engaging recess 26 having an arcuate cross section for engaging the lateral rod 8 for locking the ladder when storing the ladder, and the wall S more than the first engaging recess 26. A second section having an arcuate cross-section, which is located farther from the position, and which engages the horizontal rod 7 for locking the rear leg body 5 when using the ladder when using the ladder and engages the horizontal rail 3 of the front leg body when accommodating the ladder. The engaging recess 27 is provided. In this embodiment, the entire hook 9 is integrally formed, but it may be divided into a pair of left and right hook portions, for example.

Next, the folding ladder 1 constructed as described above.
The operation of the ladder locking device K will be described with reference to FIG.
3, FIG. 5, FIG. 7 (A), FIG. 8 and FIG. 10 (A)
Shows the state when the ladder is used, and the folding ladder 1 in this state has both legs 4, 5 so that the treads 6 are substantially horizontal.
Is in an open-leg posture with the legs spread in parallel. Then, when the ladder is used, as shown in FIG. 8 and FIG.
Rear rod 5 on the upper end side of the rear leg 5
Of the hooked portion 9b of the hook 9 attached to the wall surface S
The ladder 1 in the open state by being locked in the engagement recess 27
Can be held stably, and safety in use can be secured.

When the folding ladder 1 in the open posture as described above is used and the ladder 1 is stored, the ladder 1 is stored.
1 is lifted with both hands from the state of FIG. Then, when the rear leg 5 is lifted with the front leg 4 lying on the floor, the treads 6 rotate upward as indicated by the large arrows in FIGS. 3 and 5 to move the front leg. While being folded in parallel with the body 4 in parallel with each other, the rear leg body 5 overlaps with the front leg body 4 face-to-face, and thus the rear leg body 5 of FIG. 2, FIG. 4, FIG. 6 and FIG.
The posture becomes closed as shown in.

When the ladder is stored in this closed posture, as shown in FIGS. 9 and 10 (B), the horizontal rod 8 for locking the rear leg 5 at the time of storing the ladder is attached to the locked portion 9b of the hook 9. The lateral rail 3 of the front leg 4 is locked to the second engaging recess 27 of the engaged portion 9b while being locked to the first engaging recess 26. It should be noted that the horizontal rod 8 for locking when storing the ladder needs to be attached at the same height position as the adjacent horizontal rail 3 in a state where the front and rear legs 4, 5 are folded. Further, the mounting position of the locking horizontal rod 7 when the ladder is used is different depending on the inclination angle of the ladder 1 leaning against the wall surface (ladder standing surface) S for forming the mezzanine floor, so that the predetermined position corresponding to the required inclination angle is set. Just set it.

As described above, when the ladder is stored, the horizontal rod 8 for locking the rear leg 5 at the time of storing the ladder is locked in the first engaging recess 26 of the hook 9 and the horizontal rail 3 of the front leg 4 is locked. Second engagement recess 2
The ladder 1 folded into a flat plate shape by being locked to 7 is placed in parallel with the wall surface (ladder standing surface) S and is stably hung with the hook 9 and is stored smartly and compactly. be able to.

The hooked portion 9b of the hook 9 is a first engaging recess 26 into which the lateral rod 8 for locking when the ladder is stored is engaged.
And, at a position farther from the wall surface S than the first engaging recess 26, the lateral rod 7 for locking the rear leg 5 of the rear leg 5 is engaged when the ladder is used, and the front leg of the front leg is accommodated when the ladder is stored. Side rail 3
The first engaging recess 26 and the second engaging recess 27 are not partitioned in this way, but the second engaging recess 27 is formed to be engaged with each other. ), The horizontal rod 7 for locking when using the ladder is locked when the ladder is used, and the horizontal rod 8 for locking when storing the ladder and the horizontal rail 3 of the front leg 4 are locked when the ladder is stored. The locked portion may be a simple concave portion 28 that can be locked.

However, the first engaging recess 26 and the second engaging recess 2
According to the to-be-locked portion 9b which is formed by partitioning with 7, the lateral rod 8 for locking the rear leg body 5 at the time of housing the ladder and the horizontal rail 3 of the front leg body 4 when the ladder is housed is fixed to the first engaging recess 26. Since the second engaging recesses 27 can be accurately engaged with each other, the folded ladder can be stored and held in the storage position extremely stably.

[0021]

The ladder locking device of the invention according to claim 1 is
Provided on the upper end side of the rear leg body are a horizontal rod for locking when using a ladder and a horizontal rod for locking when storing a ladder, which is located below this horizontal rod.
Attach a hook at the required height position on the surface of the ladder, such as a wall, to which the horizontal rod for locking the ladder when using the ladder is locked, and the horizontal rod and the front part for locking the ladder when storing the ladder. When the ladder is carried around, it is provided with a locked part that locks the horizontal rail of the leg, and the hook is provided on the ladder standing surface side and the horizontal rod to which this hook locks is provided on the ladder side. There is no danger that the hook will be caught on the worker's clothes or the worker's fingers will be injured, and safety can be ensured during transportation of the ladder.

Further, when the ladder is used, the lateral rod for locking the rear leg when using the ladder is locked to the locked portion of the hook, so that the ladder in the open state can be stably held, and the rear part can be stored when the ladder is stored. By locking the horizontal rod for locking the legs when storing the ladder to the locked part of the hook, the folded ladder is placed almost parallel to the ladder stand surface and is stable and compact when suspended by the hook. Can be stored in.

According to the ladder locking device of the second aspect of the present invention, the hooked portion is located close to the ladder stand surface, and the horizontal rod for locking the ladder when it is stored is engaged when the ladder is stored. The first engaging recess and the first engaging recess that are farther from the ladder stand surface than the first engaging recess are engaged with the lateral rods for locking the rear legs of the ladder when the ladder is used and when the ladder is stored. Since it has the second engaging recess for engaging the lateral rail of the leg body, the lateral rod for locking the rear leg of the rear leg body when storing the ladder and the lateral rail of the front leg body when the ladder is housed are provided. The first engaging recess and the second engaging recess can be accurately engaged with each other, and the folded ladder can be stored and held in the storage position extremely stably.

[Brief description of drawings]

1A and 1B show an embodiment of a folding ladder of the present invention in an open-leg posture, in which FIG. 1A is a front view and FIG. 1B is a side view.

FIG. 2 shows a state in which the folding ladder of the same is stored in a closed leg posture, in which (A) is a front view and (B) is a side view.

FIG. 3 is an enlarged view of a portion surrounded by a circle shown by an arrow V in FIG.

FIG. 4 is an enlarged view of a portion surrounded by a circle shown by an arrow W in FIG.

5 is an enlarged cross-sectional view taken along line XX of FIG.

FIG. 6 is an enlarged sectional view taken along line YY of FIG.

7A is a sectional view taken along line MM in FIG. 3, and FIG. 7B is a sectional view taken along line NN in FIG.

8 is an enlarged view of a locking device portion surrounded by an ellipse indicated by an arrow O in FIG. 1 (B).

9 is an enlarged view of a locking device portion surrounded by an ellipse indicated by an arrow P in FIG. 2 (B).

FIG. 10 (A) is an enlarged vertical cross-sectional view showing a state in which a horizontal rod for locking when using a ladder is locked to a hook when using a ladder, and (B) shows a horizontal rod for locking when storing a ladder and the front side when storing the ladder. It is an expanded longitudinal cross-sectional view of the state where the required cross rail of the leg member is locked to the hook.

[Explanation of symbols]

1 Folding ladder 2 Vertical frame 3 Side rail 4 Front leg 5 Rear leg 6 Step plate 7 Side rod 8 for locking when using a ladder 8 Side rod for locking when storing a ladder 9 Hook 9a Hook attachment part 9b Hook cover Locking part 12 Hinge on the front end side of the tread plate 15 Hinge on the rear end side of the tread plate 26 First engaging recessed part of hooked part 27 Second engaging recessed part of hooked part

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Claims (2)

(57) [Claims] 1. A pair of front and rear legs having horizontal rails mounted in a plurality of upper and lower stages between a pair of left and right vertical frames, and a front end portion of a tread plate being pivotally attached to an upper side of the horizontal rail of the front leg body. , The rear end of the tread is pivotally attached to the rear leg, and both legs are opened in parallel so that each tread is approximately horizontal.Fold each tread parallel to the leg from the open leg posture when using a ladder. A device for locking a folding ladder that can be folded into a closed-leg position when storing a ladder when the ladder is in use and when the ladder is storing, and the rear legs A horizontal rod for locking when using a ladder and a horizontal rod for locking when storing a ladder that is located below this horizontal rod are provided on the upper end side of, and hooks are attached to the required height position of the ladder stand surface such as a wall surface, This hook locks a horizontal rod for locking the ladder when it is used and also for locking the ladder when it is stored. An apparatus for locking a folding ladder, comprising a locked portion for locking a horizontal rod and a horizontal rail of a front leg. 2. The hook engaging portion is located near the ladder stand surface, and has a first engaging recess into which the horizontal rod for engaging the ladder is accommodated when the ladder is accommodated, and the first engaging fit. A second member that is located farther from the ladder standing surface than the recessed portion, and engages the locking horizontal rod when using the ladder of the rear leg when using the ladder and engages the horizontal rail of the front leg when storing the ladder. The locking device for a folding ladder according to claim 1, further comprising a fitting recess.